Merge pull request #2 from dwave-examples/dash-template-files

Dash Template Files

.gitignore

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+*.DS_Store
+__pycache__
+cache
+assets/__generated_theme.css

app.py

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+# Copyright 2024 D-Wave
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import annotations
+
+import argparse
+
+import dash
+import diskcache
+from dash import DiskcacheManager
+
+from demo_configs import APP_TITLE, THEME_COLOR, THEME_COLOR_SECONDARY
+from demo_interface import create_interface
+
+# Essential for initializing callbacks. Do not remove.
+import demo_callbacks
+
+# Fix Dash long callbacks crashing on macOS 10.13+ (also potentially not working
+# on other POSIX systems), caused by https://bugs.python.org/issue33725
+# (aka "beware of multithreaded process forking").
+#
+# Note: default start method has already been changed to "spawn" on darwin in
+# the `multiprocessing` library, but its fork, `multiprocess` still hasn't caught up.
+# (see docs: https://docs.python.org/3/library/multiprocessing.html#contexts-and-start-methods)
+import multiprocess
+
+if multiprocess.get_start_method(allow_none=True) is None:
+    multiprocess.set_start_method("spawn")
+
+cache = diskcache.Cache("./cache")
+background_callback_manager = DiskcacheManager(cache)
+
+app = dash.Dash(
+    __name__,
+    meta_tags=[{"name": "viewport", "content": "width=device-width, initial-scale=1"}],
+    prevent_initial_callbacks="initial_duplicate",
+    background_callback_manager=background_callback_manager,
+)
+app.title = APP_TITLE
+
+app.config.suppress_callback_exceptions = True
+
+# Parse debug argument
+parser = argparse.ArgumentParser(description="Dash debug setting.")
+parser.add_argument(
+    "--debug",
+    action="store_true",
+    help="Add argument to see Dash debug menu and get live reload updates while developing.",
+)
+
+args = parser.parse_args()
+DEBUG = args.debug
+
+print(f"\nDebug has been set to: {DEBUG}")
+if not DEBUG:
+    print(
+        "The app will not show live code updates and the Dash debug menu will be hidden.",
+        "If editting code while the app is running, run the app with `python app.py --debug`.\n",
+        sep="\n",
+    )
+
+# Generates css file and variable using THEME_COLOR and THEME_COLOR_SECONDARY settings
+css = f"""/* Automatically generated theme settings css file, see app.py */
+:root {{
+    --theme: {THEME_COLOR};
+    --theme-secondary: {THEME_COLOR_SECONDARY};
+}}
+"""
+with open("assets/__generated_theme.css", "w") as f:
+    f.write(css)
+
+
+if __name__ == "__main__":
+    # Imports the Dash HTML code and sets it in the app.
+    # Creates the visual layout and app (see `demo_interface.py`)
+    app.layout = create_interface()
+
+    # Run the server
+    app.run_server(debug=DEBUG)